It works! Thanks a lot!
On Tuesday, September 1, 2015 at 5:42:08 PM UTC+2, Michael Bayer wrote:
>
>
>
> On 9/1/15 11:28 AM, Massi wrote:
>
> Hi everyone,
>
> I'm trying to manage read and write operations of utf-8 unicode strings
> with SQL Server (sqlalchemy 0.9.10), but I'm having some problems. I
> correctly write the strings to the database, but when I read them back and
> try to convert to unicode I get the following error:
>
> Traceback (most recent call last):
> File "C:\Users\Impara 01\Desktop\t.py", line 18, in <module>
> print unicode(row[0], "utf-8")
> UnicodeDecodeError: 'utf8' codec can't decode byte 0xe0 in position 0:
> invalid continuation byte
> Process terminated with an exit code of 1
>
> Here is a sample code showing the problem:
>
> # -*- coding: utf-8 -*-
> import sqlalchemy
> from sqlalchemy import select, create_engine, MetaData, Table, Column
> import datetime
>
> engine =
> create_engine('mssql+pyodbc://MYHOST\SQLEXPRESS/user?trusted_connection=True&charset=utf8')
> metadata = MetaData(engine)
> t = Table('test', metadata,
> Column('unicode', sqlalchemy.dialects.mssql.VARCHAR())
> )
> t.create()
> s = "àèìòù"
> s = unicode(s, "utf-8")
> t.insert().values(unicode=s).execute()
> res = select([t.c.unicode]).execute().fetchall()
> for i, row in enumerate(res):
> print unicode(row[0], "utf-8")
>
> Can anyone point me out what I'm doing wrong?
>
>
> pyodbc and SQL Server are very particular about unicode. In this case it
> seems like you are passing a Python unicode literal into Pyodbc, and
> assuming Pyodbc knows how to handle that, but then on the reception side
> you're assuming that you're getting a bytestring back, and not again a
> Python Unicode object.
>
> to do a unicode round trip, use the SQLAlchemy Unicode type, and deal only
> with Python unicode literals in your script:
>
> t = Table(.... Column('x', sqlalchemy.Unicode()))
>
> s = u'àèìòù'
>
> t.insert().values(unicode=s) ...
>
> for row in res:
> print row[0]
>
> SQLAlchemy will make sure that the value is passed to pyodbc in the
> expected format, in this case it is likely encoding to utf-8 on the way in
> and decoding from utf-8 on the way out.
>
>
>
>
>
> Thanks in advance!
>
>
>
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